Pendulum mechanism loading test device

Abstract

The invention relates to a pendulum mechanism loading test device, which is characterized in that the rotation output of a swing angle output mechanism to be tested is converted into the swing of the tail end of a swing rod of a simulated load bracket, and the motion trail of the tail end of the simulated load bracket is an arc. The arc motion at the tail end of the simulated load support swing rod is orthogonally decomposed into linear motion in the horizontal direction and the vertical direction, and according to the linear motion displacement in the horizontal direction or the vertical direction, the swing angle rotationally output by the to-be-measured swing angle output mechanism is calculated through a trigonometric function relational expression.

Description

Technical Field

[0001] The invention relates to a loading test device for a swing mechanism, belonging to the technical field of test equipment. Background Art

[0002] Reciprocating swing mechanism is a common mechanical motion device in engineering, which is usually divided into direct rotation output form and swing output form. When the reciprocating swing rotation angle is small, the feedback signal noise of the commonly used angle sensor is relatively large and the measurement accuracy is low. In addition, due to space and cost considerations, some swing mechanisms often do not have the conditions for high-precision measurement sensor devices; therefore, the test device developed for the swing angle output device is particularly necessary.

[0003] Patent CN103217095A (A Steering Wheel Angle Measuring Device) states that the steering wheel angle measuring device is composed of an internal gear pair, a magnet, a magnetic induction sensor and other components. A magnet and a magnetic induction sensor are used to detect the steering wheel rotation angle, and the structure is simple. Such angle measuring devices all require the use of photoelectric angle sensors or magnetic induction sensors, which are still relatively expensive and are not suitable for small swing angle output mechanisms.

[0004] Patent CN110260777B (an embedded rudder angle measuring device) states that the embedded rudder angle measuring device includes a bearing, a lead screw, a lead screw nut, a shift fork, a potentiometer assembly, etc. The joint bearing drives the shift fork to rotate, and the potentiometer detects the rotation angle. This embedded structure effectively saves the size and space of the angle measuring device, but it is difficult to accurately measure when the rudder angle is small.

[0005] Regarding the angle measurement problem of the swing angle output mechanism, the existing technologies each have their own characteristics, but it is difficult to achieve high-precision measurement of small rotation angles while simplifying the structure of the test equipment and reducing the manufacturing cost. Summary of the invention

[0006] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a pendulum mechanism loading test device, which solves the problem that the small rotation angle output by the swing mechanism is difficult to accurately measure, and at the same time can load the rated load installed on the swing mechanism during its movement.

[0007] The solution to the technical problem of the present invention is: a pendulum mechanism loading test device, which converts the rotational output of the swing angle output mechanism to be tested into the swing of the end of the swing rod of the simulated load bracket, the motion trajectory of the end of the simulated load bracket is an arc, and the arc motion of the end of the swing rod of the simulated load bracket is orthogonally decomposed into linear motion in the horizontal direction and the vertical direction. According to the linear motion displacement in the horizontal direction or the vertical direction, the swing angle of the rotational output of the swing angle output mechanism to be tested is calculated by a trigonometric function relationship.

[0008] Another technical solution of the present invention is: a pendulum mechanism loading test device, which includes a test platform, a simulated load bracket, a slider bracket, a connecting rod, a joint pin, a joint bearing, a linear displacement sensor, a long guide rail, a short guide rail, a first slider, and a second slider; the linear displacement sensor includes a sensor bracket and a sliding brush.

[0009] The swing angle output mechanism to be measured and the long guide rail are installed on the test platform; one end of the simulated load bracket is connected to the output shaft of the swing angle output mechanism to be measured, and the other end of the simulated load bracket is provided with a through hole perpendicular to the direction of the test platform, and the joint pin is inserted into the through hole, one end of the connecting rod is connected to the joint pin through a joint bearing, and the other end is fixedly connected to the first slider, the slider bracket is a cross bracket, and a cross beam is provided on the upper layer, the first slider slides along the short guide rail, the short guide rail is fixedly connected to the upper surface of the slider bracket cross beam, and one end of the lower surface of the slider bracket cross beam is fixedly connected to the second slider; the second slider slides along the long guide rail; the long guide rail is fixed on the test platform; the short guide rail is perpendicular to the long guide rail;

[0010] The other end of the lower surface of the slider bracket crossbeam is inserted into the circular hole of the sliding brush of the linear displacement sensor. The sliding brush is located in the sensor bracket, and the sensor bracket is parallel to the long guide rail. When the slider bracket is driven to move by the simulated load bracket, the motion is transmitted to the sliding brush of the displacement sensor. When the position of the sliding brush changes, the output voltage of the displacement sensor changes. According to the change in the output voltage of the displacement sensor, the swing angle of the simulated load bracket is calculated, that is, the rotation angle θ of the initial and final positions of the output shaft of the swing angle output mechanism to be measured.

[0011] Preferably, the rotation angle θ between the initial and final positions of the output shaft of the swing angle output mechanism to be measured is:

[0012]

[0013] Among them, V0 and V1 are the output voltage values ​​of the displacement sensor slider corresponding to the initial and final positions of the output shaft of the swing angle output mechanism to be measured, R is the feedback gradient of the linear displacement sensor, unit: V / mm, L is the distance from the pin hole on the simulated load bracket to the output shaft of the swing angle output mechanism to be measured.

[0014] Preferably, when the sensor bracket is installed, the long side is closely attached to the first positioning side of the test platform;

[0015] When installing the long guide rail, place the long side close to the second positioning side of the test platform;

[0016] The first positioning edge and the second positioning edge are in the same plane and are parallel to each other, so that the moving direction of the second sliding block is parallel to the moving direction of the sliding brush of the linear displacement sensor.

[0017] Preferably, the swing angle output mechanism to be measured is positioned and installed by a positioning boss on the test platform.

[0018] Preferably, the electrical range of the linear displacement sensor is 110 mm. When the distance between the pin of the simulated load bracket and the rotating shaft is 155 mm, the measurable angular range of the output shaft of the swing angle mechanism to be measured is ±20°.

[0019] Preferably, the above-mentioned pendulum mechanism loading test device further includes a rope, a pulley, and a weight;

[0020] The pulley is installed on the test platform through a bracket and is located on the side of the simulated load bracket. The roller of the pulley is parallel to the short guide rail of the test platform. The simulated load bracket is provided with a vertical column, which is perpendicular to the test platform and is located on the connection point between the simulated load bracket and the swing angle output mechanism to be measured and the connection line of the joint pin shaft;

[0021] One end of the rope is hung on the vertical column of the simulated load bracket, and the other end is passed around the pulley. After changing direction, a weight of specified weight is hung on it, so that the swing angle output mechanism to be measured is subjected to load torque during movement.

[0022] Preferably, there are two pulleys, which are symmetrically arranged on both sides of the swing angle output mechanism to be measured.

[0023] The beneficial effects of the present invention compared with the prior art are:

[0024] (1) The present invention adopts a dual guide rail + slider solution to amplify the small angle rotation of the output shaft of the swing angle output mechanism and convert it into linear motion, thereby performing precise measurement.

[0025] (2) The present invention reduces the requirements for component processing accuracy by adding a positioning boss to the test platform and using a guide rail slider solution to achieve motion decomposition. At the same time, it can ensure that the equipment assembly accuracy meets the requirements, thereby reducing processing costs while ensuring measurement accuracy.

[0026] (3) The mechanism of the present invention is applied to the measurement of small rotation angles of the output shaft of the swing angle output mechanism. The test equipment is simple and can realize bidirectional loading in the form of rope + pulley assembly + weight mounting. It is also suitable for load testing of high-precision electromechanical actuators. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a front view of the measurement device structure according to an embodiment of the present invention.

[0028] Figure 2 This is a top view of the structure of the measuring device according to an embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the connection between the simulated load bracket and the sliding module according to an embodiment of the present invention.

[0030] Figure 4 Schematic diagram of the connection between the slider bracket and the linear displacement sensor in an embodiment of the present invention.

[0031] Figure 5 Schematic diagram of the relationship between the displacement sensor voltage and angle calculation in an embodiment of the present invention

[0032] Figure 6 A simplified diagram of a test device loading in an embodiment of the present invention;

[0033] Figure 7 This is a simplified diagram of the installation and positioning of various components in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] The present invention provides a pendulum mechanism loading test device, which converts the rotation output of the swing angle output mechanism 11 to be tested into the swing of the end of the swing rod of the simulated load support, the motion trajectory of the end of the simulated load support is an arc, and the arc motion of the end of the swing rod of the simulated load support is orthogonally decomposed into linear motion in the horizontal direction and the vertical direction. According to the linear motion displacement in the horizontal direction or the vertical direction, the swing angle of the rotation output of the swing angle output mechanism 11 to be tested is calculated by a trigonometric function relationship. The swing angle output mechanism 11 to be tested can be an electromechanical actuator.

[0036] like Figure 1 and Figure 2 As shown, the present invention is a pendulum mechanism loading test device, including a test platform 1, a simulated load bracket 2, a slider bracket 3, a connecting rod 4, a joint pin 5, a joint bearing 6, a linear displacement sensor 7, a long guide rail 8, a short guide rail 9, a first slider 10-1, a second slider 10-2, a swing angle output mechanism to be measured 11, and a pulley 12.

[0037] like Figure 1 As shown, when the swing angle output mechanism 11 to be measured is installed on the test platform 1, accurate positioning is achieved by the tail end being close to the protrusion of the test platform to ensure that the parallelism tolerance of the displacement sensor, the long guide rail and the swing angle output mechanism to be measured is less than 0.02, and at the same time, they are fastened by screws; a simulated load bracket 2 is installed on the output shaft of the swing angle output mechanism 11 to convert the rotational output of the swing mechanism into the swing of the end of the swing rod of the simulated load bracket. The motion trajectory of the end of the simulated load bracket is an arc, which can be decomposed into linear motion in the horizontal and vertical directions.

[0038] like Figure 2As shown, the swing angle output mechanism 11 to be measured and the long guide rail 8 are installed on the test platform 1 by screws; one end of the simulated load bracket 2 is connected to the output shaft of the swing angle output mechanism 11 to be measured, and the other end of the simulated load bracket 2 is provided with a through hole perpendicular to the direction of the test platform, and the joint pin 5 is inserted into the through hole. One end of the connecting rod 4 is connected to the joint pin 5 through a joint bearing and the other end is fixedly connected to the first slider 10-1. The slider bracket 3 is a cross bracket, and a cross beam is provided on the upper layer. The first slider 10-1 slides along the short guide rail 9, and the short guide rail 9 is fixedly connected to the upper surface of the cross beam of the slider bracket 3 by screws, and one end of the lower surface of the cross beam of the slider bracket 3 is fixedly connected to the second slider 10-2; the second slider 10-2 slides along the long guide rail 8; the long guide rail 8 is fixed on the test platform; the short guide rail 9 is perpendicular to the long guide rail 8; the first slider 10-1 moves in the vertical direction, and the second slider 10-2 moves in the horizontal direction.

[0039] like Figure 4 As shown, the other end of the lower surface of the crossbeam of the slider bracket 3 is inserted into the circular hole of the sliding brush of the linear displacement sensor. The sliding brush is located in the sensor bracket, and the sensor bracket is parallel to the long guide rail 8. When the slider bracket 3 is driven to move by the simulated load bracket, the movement is transmitted to the sliding brush of the displacement sensor. When the position of the sliding brush changes, the output voltage of the displacement sensor changes. According to the change in the output voltage of the displacement sensor, the swing angle of the simulated load bracket is calculated, that is, the rotation angle θ of the initial and final positions of the output shaft of the swing angle output mechanism 11 to be measured.

[0040] like Figure 5 As shown in the figure, the motion trajectory of the end of the simulated load bracket installed on the swing angle output mechanism to be measured is an arc. After decomposing it into linear motion in the horizontal and vertical directions, the rotation angle of the simulated load bracket can be calculated by calculating the linear motion distance in the vertical direction. Then the rotation angle θ of the initial and final positions of the swing angle mechanism to be measured is:

[0041]

[0042] Among them, V0 and V1 are the output voltage values ​​of the displacement sensor slider corresponding to the initial and final positions of the output shaft of the swing angle output mechanism 11 to be measured, R is the feedback gradient of the linear displacement sensor, unit: V / mm, and L is the distance from the pin hole on the simulated load bracket 2 to the output shaft of the swing angle output mechanism 11 to be measured.

[0043] like Figure 6As shown, when the swing angle mechanism to be measured moves, it can be loaded by hanging weights. The pulley 12 is installed on the test platform through a bracket, located on the side of the simulated load bracket 2, the roller of the pulley 12 is parallel to the short guide rail 9 of the test platform, and a vertical column is provided on the simulated load bracket 2, which is perpendicular to the test platform and located on the connection point between the simulated load bracket 2 and the swing angle output mechanism to be measured 11 and the connection line of the joint pin 5; one end of the rope is hung on the vertical column of the simulated load bracket 2, and the other end passes around the pulley 12, and after changing direction, a weight of a specified weight is hung, so that the swing angle output mechanism to be measured is subjected to load torque when it moves.

[0044] There can be two pulleys 12, which are symmetrically arranged on both sides of the swing angle output mechanism 11 to be tested. The pulleys on both sides of the test platform enable the test equipment to apply load moments in two directions to the device to be tested.

[0045] like Figure 7 As shown, when the sensor bracket is installed, the long side is placed close to the first positioning side of the test platform;

[0046] When installing the long guide rail 8, place the long side close to the second positioning side of the test platform;

[0047] The first positioning edge and the second positioning edge are in the same plane and are parallel to each other, so that the moving direction of the second slider 10 - 2 is parallel to the moving direction of the sliding brush of the linear displacement sensor.

[0048] In a specific embodiment of the present invention, the positioning accuracy of the test equipment is determined by the positioning boss on the test platform. When the linear displacement sensor is installed, the long side needs to be close to the positioning edge of the test platform installation; when the long guide rail is installed, the long side needs to be close to the positioning edge of the test platform installation; when the swing angle mechanism to be measured is installed, the long side needs to be close to the positioning edge of the test platform installation. Since the parallelism of these three sides is required to be high during the processing of the test platform, when each component is installed in the correct position, the installation accuracy of the test equipment can be further improved.

[0049] according to Figures 1 to 7 The test equipment described above uses a linear displacement sensor with an electrical range of 110 mm. When the distance between the pin of the simulated load bracket and the rotating shaft is 155 mm, the angular range of the output shaft of the swing angle mechanism to be measured is ±20°. Similarly, when a higher precision or larger angle range measurement is required, a linear displacement sensor with a larger range can be selected based on the same principle, and a longer simulated load bracket can be designed.

[0050] The present invention provides a pendulum mechanism loading test device, which adopts a double guide rail + slider solution to amplify the small angle rotation of the output shaft of the swing angle output mechanism and convert it into linear motion, so as to perform accurate measurement, thereby solving the problem that the small angle of the swing angle output mechanism is difficult to accurately measure, and at the same time, the rated load can be installed on the swing angle mechanism to be tested during its movement. In addition, the test equipment requires fewer precision components, has a simple structure, low cost, and wide applicability.

[0051] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A pendulum mechanism loading test device, characterized in that The rotation output of the swing angle output mechanism (11) to be measured is converted into the swing of the end of the swing rod of the simulated load bracket. The motion trajectory of the end of the simulated load bracket is an arc. The arc motion of the end of the swing rod of the simulated load bracket is orthogonally decomposed into linear motion in the horizontal direction and the vertical direction. According to the linear motion displacement in the horizontal direction or the vertical direction, the swing angle of the rotation output of the swing angle output mechanism (11) to be measured is calculated by a trigonometric function relationship.

2. A pendulum mechanism loading test device, characterized in that The invention comprises a test platform (1), a simulated load bracket (2), a slider bracket (3), a connecting rod (4), a joint pin (5), a joint bearing (6), a linear displacement sensor (7), a long guide rail (8), a short guide rail (9), a first slider (10-1), and a second slider (10-2); the linear displacement sensor comprises a sensor bracket and a sliding brush. The swing angle output mechanism (11) to be measured and the long guide rail (8) are installed on the test platform (1); one end of the simulated load bracket (2) is connected to the output shaft of the swing angle output mechanism (11) to be measured, and the other end of the simulated load bracket (2) is provided with a through hole perpendicular to the direction of the test platform, and the joint pin shaft (5) is inserted into the through hole. One end of the connecting rod (4) is connected to the joint pin shaft (5) through a joint bearing, and the other end is fixedly connected to the first slider (10-1). The slider bracket (3) is a cross bracket, and a cross beam is provided on the upper layer. The first slider (10-1) slides along the short guide rail (9), and the short guide rail (9) is fixedly connected to the upper surface of the cross beam of the slider bracket (3), and one end of the lower surface of the cross beam of the slider bracket (3) is fixedly connected to the second slider (10-2); the second slider (10-2) slides along the long guide rail (8); the long guide rail (8) is fixed on the test platform; the short guide rail (9) is perpendicular to the long guide rail (8); The other end of the lower surface of the crossbeam of the slider bracket (3) is inserted into the circular hole of the sliding brush of the linear displacement sensor, the sliding brush is located in the sensor bracket, and the sensor bracket is parallel to the long guide rail (8); when the slider bracket (3) is driven to move by the simulated load bracket, the movement is transmitted to the sliding brush of the displacement sensor, and when the position of the sliding brush changes, the output voltage of the displacement sensor changes. According to the change in the output voltage of the displacement sensor, the swing angle of the simulated load bracket is calculated, that is, the rotation angle θ of the initial and final positions of the output shaft of the swing angle output mechanism (11) to be measured.

3. A pendulum mechanism loading test device according to claim 1, characterized in that The rotation angle θ between the initial and final positions of the output shaft of the swing angle output mechanism (11) to be measured is: Wherein, V0 and V1 are the output voltage values ​​of the displacement sensor slider corresponding to the initial and final positions of the output shaft of the swing angle output mechanism (11) to be measured, R is the feedback gradient of the linear displacement sensor, unit: V / mm, and L is the distance from the pin hole on the simulated load bracket (2) to the output shaft of the swing angle output mechanism (11) to be measured.

4. A pendulum mechanism loading test device according to claim 1, characterized in that: When installing the sensor bracket, place the long side close to the first positioning side of the test platform; When installing the long guide rail (8), place the long side close to the second positioning side of the test platform; The first positioning edge and the second positioning edge are in the same plane and are parallel to each other, so that the moving direction of the second sliding block (10-2) is parallel to the moving direction of the sliding brush of the linear displacement sensor.

5. The pendulum mechanism loading test device according to claim 1, characterized in that: The swing angle output mechanism (11) to be measured is positioned and installed via a positioning boss on the test platform.

6. A pendulum mechanism loading test device according to claim 1, characterized in that The electrical range of the linear displacement sensor is 110 mm. When the distance between the pin of the simulated load bracket and the rotating shaft is 155 mm, the angular range of the output shaft of the swing angle mechanism to be measured is ±20°.

7. The pendulum mechanism loading test device according to claim 1, characterized in that Also includes ropes, pulleys (12), and weights; The pulley (12) is installed on the test platform through a bracket and is located on the side of the simulated load bracket (2). The roller of the pulley (12) is parallel to the short guide rail (9) of the test platform. The simulated load bracket (2) is provided with a vertical column, which is perpendicular to the test platform and is located on the connection point between the simulated load bracket (2) and the swing angle output mechanism (11) to be measured and the connection line of the joint pin shaft (5); One end of the rope is hung on the vertical column of the simulated load bracket (2), and the other end is passed around the pulley (12). After changing the direction, a weight of a specified weight is hung, so that the swing angle output mechanism to be measured is subjected to the load torque when moving.

8. A pendulum mechanism loading test device according to claim 1, characterized in that There are two pulleys (12), which are symmetrically arranged on both sides of the swing angle output mechanism (11) to be measured.

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